Buffer overflow in Cesanta Mongoose
CVE-2026-5244
A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow…
Vulnerability class: Buffer Overflow
EPSS: 0.001 (27.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- VDB-354825 | Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-based overflow (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-354825 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #770063 | Cesanta Mongoose 7.20 Heap-based Buffer Overflow (Exploit, Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (Patch, patch)
- cna@vuldb.com (Product, Release Notes, patch)
- cna@vuldb.com (Product, product)
Frequently asked questions
- What is CVE-2026-5244?
- CVE-2026-5244 is a high-severity vulnerability in Cesanta Mongoose, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-04-02.
- How severe is CVE-2026-5244?
- High severity. CVSS v3 base score is 7.3 out of 10.